Torch coral HELP needed

Bought myself a nice torch coral last weekend, its been opening over the last week and all been good, Before leaving to go away on Friday it was healthy, got back earlier to find something is has gone wrong, 2 of the 4 heads have a funny jelly on it, there is no sign of its tentacles, PLEASE HELP, should I separate the other 2 heads off the piece before they die too?

Looks like it could be brown jelly disease, just to be safe separate the healthy heads immediately before it spreads.

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Woke up this morning and its already covered the other 2 head, quickly removed it and washed it in a tincture of idodine mix (only thing I had), its remove alot of the slime and you can still see alot of the polyp left, where to from here?
will this heal?
whats caused it?
can it spread to my other corals?

I've just discovered my frogspawn has it too, it also just started not opening properly, a day or so ago, now traces of the brown jelly, So I syphoned the bit of jelly off and removed it for a dip, hold thumbs for me